Chang has a long history. According to legend, the emperor had ministers Chang Xian and Chang Yi, but there was no information about his activities in Xia and Shang Dynasties. When his brother Yu Kang was sealed and returned to Wei, Yu Kang's uncle took ordinary grain, and later generations took the city name as their surname. During the Spring and Autumn Period, the King of Wu established a branch in Changli, and later generations took the name of the city as their surname. Dr. Chu's constant thinking, followed by constant surname and constant surname. In order to avoid anonymity in North Song Zhenzong, he changed his surname to Chang.